1.Tính nhẩm :
a]
\[0 \times 2 = ....\] \[0 \times 5 = ....\] \[3 \times 0 = ....\]
\[1 \times 0 = ....\] \[2 \times 0 = ....\] \[5 \times 0 = ....\]
\[0 \times 3 = ....\] \[0 \times 1 = ....\]
b]
\[0:5 = ....\] \[0:4 = ....\] \[0:3 = ....\]
\[0:1 = ....\]
2.Số ?
3.Tính :
a]
\[\eqalign{ & 4:4 \times 0 = .............. \cr & {\rm{ = }}............... \cr} \] \[\eqalign{ & 8:2 \times 0 = .............. \cr & {\rm{ = }}............... \cr} \] \[\eqalign{ & 3 \times 0:2 = .............. \cr & {\rm{ = }}............... \cr} \]
b]
\[\eqalign{ & 0:5 \times 5 = .............. \cr & {\rm{ = }}............... \cr} \] \[\eqalign{ & 0:2 \times 1 = .............. \cr & {\rm{ = }}............... \cr} \] \[\eqalign{ & 0 \times 6:3 = .............. \cr & {\rm{ = }}............... \cr} \]
Giải
1.Tính nhẩm :
a]
\[0 \times 2 = 0\] \[0 \times 5 = 0\] \[3 \times 0 = 0\]
\[1 \times 0 = 0\] \[2 \times 0 = 0\] \[5 \times 0 = 0\]
\[0 \times 3 = 0\] \[0 \times 1 = 0\]
b]
\[0:5 = 0\] \[0:4 = 0\] \[0:3 = 0\]
\[0:1 = 0\]
2.Số ?
3.Tính :
a]
\[\eqalign{ & 4:4 \times 0 = 1 \times 0 \cr & {\rm{ = 0}} \cr} \] \[\eqalign{ & 8:2 \times 0 = 4 \times 0 \cr & {\rm{ = 0}} \cr} \] \[\eqalign{ & 3 \times 0:2 = 0:2 \cr & {\rm{ = 0}} \cr} \]
b]
\[\eqalign{ & 0:5 \times 5 = 0 \times 5 \cr & {\rm{ = 0}} \cr} \] \[\eqalign{ & 0:2 \times 1 = 0 \times 1 \cr & {\rm{ = 0}} \cr} \] \[\eqalign{ & 0 \times 6:3 = 0:3 \cr & {\rm{ = 0}} \cr} \]